<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <form id="form1" action="">
        <div><strong>这是1.html页面<strong>
                    <iframe src="./2.html" width="500px" height="300px"></iframe> </strong></strong></div>
    </form>
    <pre>

</body>
</html>